Burner.



C. W. DAVIS.

BURNER.

APPucATloN man JULY lsv. 1ers.

1,290,107., l Patented Jan. 7,1919.

` 3 SHEETS-SHEET l.

C. W'. DAVIS.

BURNER.

APPLICATION FILED IIILY I5. I9I5.

1,290,107., Patented Jan. 7,1919.

3 SHEETS-SHEET 2.

C. W. DAVIS.

BURNER.

APPLICATION FILED 1ULY15.19|5.

1,290,107. Patented Jan. 7,1919.

3 SHEETS-SHEET 3.

dit@ @Fhliid CORTLAND W. DAVIS, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE MANTLE l:LAMP COM- PANY 0F AMERICA, OF CHICAGO, ILLINOIS, A CORPORATION 0F ILLINOIS.

BURNER.

Application led July 15, 1915.

To all whom it may concern:

Be it known that I, CORTLAND W. DAVIS, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Burners; and I do hereby declare the following to be a full, clear,l and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

In incandescent mantle lamps of the blue iiame wick type, several forms of lamps have been manufactured and used, which include burners having an inner wick tube and an outer wick tube, providing for introducing air over the wick from both sides thereof. One of the most satisfactory forms of burner is that type which is used on a central draft lamp. In all central draft lamps with which I am familiar, it has been considered necessary to mount the inner wick tube on the base or reservoir of the lamp, and to place the detachable burner in coperat-ion therewith, the wick being either carried by the burner or mounted on the inner wick tube with the outer wick tube supported on the burner. To obtain maximum results in an incandescent mantle lamp of the wick type, it is necessary that close adjustments be made with relation to the various parts. While these close adjustments may be satisfactorily arranged at the factory, they may be distorted during the shipment of the lamp to the customer', or the lamp may receive some injury by the customer which would displace the relative positions of the burner parts, especially the inner wick tube with relation to other burner parts. It has been found that where the inner wick tube extends from the base or reservoir of the lamp into the burner, to coperate with the outer wick tube and other parts of the burner, an accident might occur which would indent the reservoir which might serve to lower the wick tube slightly, or elevate it slightly, or move it from its vertical alinement, and such distortion has `been found to seriously affect the burning characteristics of the lamp.

One type of lamp has been made` which overcomes the defects-of the central draft Specification of Letters Patent.

Patented Jan. t, imita.

serial No. 40,028.

lamps, having the inner tube attached to the base or reservoir. This type, known as a side draft (burner) lamp, employs a burner having a short inner wick tube mounted in spaced relation to an outer wick tube and side air ports, extending through the two wick tubes so that air is admitted to the inner wick tube. In this construction, it is customary to close the lower end of the inner wick tube to prevent fuel oil spilling frrlm the reservoir through the inner wick tu e.

However, it is well known to those skilled in the art that when air is introduced transversely into an inner wick tube as in the operation of a side draft burner, the How of air is not as efficient as in the case of the central draft type lamp where air is admitted vertically to the inner wick tube and flows only in one direction to the ame spreader.

Moreover, by positioning Side draft air ports between the inner and outer wick tube, space is used which is most desirable for a wick passage necessitating in the practical construction of a burner, an enlargement in the inner and outer wick tubes so as to provide enough space in which the wick may operate satisfactorily. This changes the direction of the path of the wick from the vertical to the oblique and, impedes an easy wick movement and also makes it difficult to provide a satisfactory wick elevating mechanism.

Recognizing the defects in the prior types of lamps and with a view to increasing the eiiiciency of a burner as well as utilizing the advantages of a central draft lamp, the invention deals with a burner which may be applied as an article of manufacture to a lamp of the central draft type, wherein the upper end of the inner wick tube of the lamp may terminate at a position within or slightly above the fuel reservoir. The burner for application to such a reservoir` is constructed with an inner wick tube open throughout the length thereof and this tube is mounted in its predetermined adjusted relation to the outer wick tube, the spacing means being so arranged that the maximum eiiiciency of an interposed wick may be obtained without loss of function of the wick.

Dividingthe inner wick tube into a plurality of coperating sections, permits the interchangeability of burners with reservoirs having an inner wick tube section, the section of the Wick tube carried by the burner being arranged to coperate with a section carried by the reservoir to forni a continuous air conductor from'the base of the lamp to the .flame spreader.

The invention contemplates further, the division ofthe outer wick tube of the burner into a plurality of sections, one section, which is adjacent the flame, being supported from the burner by means of a foraminous section which allows of air introduction t0 the Haine and dissipates heat to the incoming air. The other section of the outer wick tube is secured to the burner, and is provided with means to connect the same to the inner Wick tube, whereby the inner and outer wick tubes are maintained in their spaced positions relative to each other.

To overcome the objection 0f the displacement of the inner wick tube, with relation to other parts of the burner by injury to the reservoir, or other parts of the lamp, it is preferred that the inner wick tube sections be mounted for telescopic cooperation with relation to each other, so that a variation in position may occur in the connection between tlie burner and its reservoir without aliecting the character of the illumination or interfering with the proper functioning of the burner. With this and other objects in view, the invention comprises a burner wherein the air introduction and the finer adjustments are all disposed within the burner section of a lamp, thereby saving labor in the manufacture of a lamp of this character by limiting the skilled workmanship to the essential portions of the lamp structure.

An embodiment of the invention is disclosed in the accompanying drawings, but -it is to be understood that the construction therein set forth is for the purpose ofillustrat-ion only, and not as defining the limits of the invention.

In the drawings:

Figure 1 ,is a front elevation, partly in secion, disclosing a burner mounted upon its ase.

Fig. 2 is a plan view of a section of the burner which 'includes a removable section of the outer wick tube and its foraminous spacing element.

Fig. 3 is a side elevation of the structure illustrated in Fig. 2.

Fig. 4 is a plan view 0f a burner with the flame spreader and the outer wick tube structure of Fig. 2 removed.

Fig. 5 is an enlarged detail view of the mounting of the pinion to engage the wick rack.

Fig. 6 is a detail sectional view of the inner sectional wick tube disclosing a nenheat conducting ring interposed between the inner tube sections. n

Fig. 7 is a plan view of the wick raising. rack. i

Fig. 8 is a side elevation of the wick raising rack.

Fig. 9 is an enlarged vertical sectional view of a burner showing a wick inserted therein.

The lamp is shown provided with a reservoir section l, a base section 2, and a burner section. The base section 2 may be provided with a section 3 of the inner wick tube. This section 3 of the inner wick tube is shown provided with a contracted upper end forming a shoulder at 4 to produce a part 5 of less diameter than the part 3 of the tube and another shoulder 6 producing a part 7 o f less diameter than the part 5. This section of the wick tube 3 may be secured to the lamp base 0r the reservoir in any suitable manner, and is shown applied to a lamp of the central draft type wherein air is admitted to the lamp from the base as at 8.

The upper part of the reservoir section of the lamp may be threaded as at 9 to receive a burner, which is provided with threads to co'iperate with the threads 9 of the reservoir section.

The burner is removable as an entirety from the lamp. It is provided with inner andouter wick tubes-and carries the wick in its structure in such manner that the burner is interchangeable with a lamp base of the form wherein a wick tube will coperate with the wick tube section carried by the burner to furnish a central air draft for the burner. In the form disclosed in the drawings, the burner is shown provided with an Ainner wick tube section 10 which is adapte to be telescopically mounted over the contracted end of the wick tube section- 3 of the reservoir. If desired, the inner wick tube may be provided with a perforation 11 as shown 1n Fig. 6, whereby the condensation of fuel, which may pass down the inside of the inner wick tu'be 10 is returned to the reservoir 1 through aperture 11 of the inner wick tube. A collar of material which 1s a poor conductor of heat indicated at 12, may be provided to prevent the conduction of heat from the wick tube section 10 to the w1ck tube section 3 and thereby prevent the heating of the Oil within the reservoir. The burner section of the wick tube' 10 is shown provided witha knurl 13 t0 serve as means Eo support a flame spreader 14 of any desired .Ype-

The burner is shown provided with an outer. foraminous supporting element 15 forming the usual burner basket which is provided with a shoulder indicated at 16 serving as a seat for a foraminous spacing element 17 which serves to mount the upper section of the outer wick tube 18. This upper section of the wick tube 18 may be provided with a flame flange 19. The spacing element 17 may be provided with an upstanding flange 20 into which may be cut notches 21 which are adapted to register with locks 22 carried' by the burner shoulderl 16. The flange 20-may be cut away on an inclined plane as at 23 adjacent the notches 21 to ride against the locks 22 and serve to bind the supporting element firmly in position on the burner frame 15, thereby maintaining the outer Wick tube 18 firmly in its operative position with relation to the center tube and the wick. The supporting collar 16 may be provided also with notches 24 to permit suitable fastening means, not shown, carried by the lamp gallery indicated at 25 to engage the burner ring 16 and lock the gallery in position on the burner. The gallery 25 is shown provided with a. removable burner cone 25a having an inturned flange 25h, and provided also with a removable thimble type flame spreader 14 mounted on the inner wick tube in coperative relation to said burner cone.

The outer wick tube 18 is shown provided `with a flared lower portion 26 which is designed to telescopically engage a fixed section 27 of the outer wick tube carried by the burner. This fixed section is retained in position in any suitable manner in the burner, and is provided with vanes 28 which space the inner wick tube 10 from the outer wick tube section 27 and retain said wick tube sections in their spaced cooperative relation.

It is obvious that the outer wick tube can be made in a single continuous form as is the inner wick tube of the burner, and that the spacing element 17 may be made in the form of a foraminous ring-like structure tomaintain the wick tubes in their proper relation to the sides 15 of the burner. In a practical form of the lamp, the inner and outer wick tubes should terminate at substantially the same plane at the up-per end of theburnei in order that air may be properly introduced to the flame to produce maximum resuits.

The fixed section 27 of the outer wick tube may be provided with a bracket 29 `having an arm 30 bent to form a guide for Vbeing positioned between the inner wick tube 10 and the outer wick tube 27 to straddle the vanes 28, as shown in Fig. 9 wherein the Wick w is illustrated partly in front of one of the vanes 28 and in the rear of another vane 28. The plate 33 of the rack is offset from the vertical alinementfof the rack ,whereby the plate may position directly into contact with. the wick or its Wick carrier, while the rack 31 Vmay position exterior of the outer wick tube 27 to operate parallel to the fixed section of the outer Wick tube.

By the arrangement of the burner herein disclosed, no injury which may occur in the base, which does not materially affect the vertical position of the inner wick tube 3 or the threads 9, will have any substantial effect on the burning qualities of the lamps, inasmuch as the reduced upper end of the inner wick tube 3 will permit of Vertical adjustment of the burner on the lamp. In some forms of central draft lamps, the adjustment is so close that should the operator not properly turn the burner to its threaded limit on the reservoir section, the ends of the inner and outer wick tubes will not properly coperate to produce the best results in illumination. By arranging the inner and outer wick tubes in fixed relation in the burner of a lamp o'f the central draft type, there is no liability of the parts being inoperative, due to carelessness on the part of the operator, in applying the burner to the lamp reservoir. Moreover, the burner of this type permits of utilizing the advantages of the more desirable air supply of the central draft type of lamp. After the wick has been thoroughly impregnated with the fuel, and the lamp has been burning for a. short period of time, the burner of the type herein disclosed may be completely removed from its reservoir and base and held a substantial distance away from the reservoir and the combustion and illumination will proceed in the same manner as when the burner is on the lamp reservoir, until the fuel supply has been exhausted by its consumption.

It. is obvious that various changes in the form and proportion of the parts may be made without departing from the spirit of the invention, and the right is reserved to make such alterations and changes as fairly fall within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A lamp of the central draft blueflame Wick type, including a reservoir and a central air tube, and having a unitary removable burner' comprising imperforate and relatively non-adjustable outer and inner wick tubes, said wick tubes being re spectively separable from the reservoir and its central air tube, and means to support said wick tubes from the burner.

2. A lamp of the central draft blue-flame wick typeincluding ay reservoir and a central air tube, and having a unitary remov- `able burner, comprising imperforate outer and inner Wick tubes, both of said Wick tubes being separable from the reservoir and its central air tube, and means to secure the inner wick tube to said outer wick tube.

3. A lamp of the central draft blue-flame wick type, including a reservoir and a central air tube, and havinga unitary removable ybur'ner comprising an imperforate outer wick tube provided -with a removable upper section, and an inner wick tube, both of said wick tubes being separable from the reservoir and the central air tube, and means to support the wick tubes from the urner.

4. A lamp of the central draft blue-flame wick type, including a reservoir and a central air tube, and having a unitary removable burner comprising inner fand :outer wick tubes, the outer wick tube having a plurality of sect-ions, one of which is supported by a. removable perforated support ing element.

5. As an article of manufacture, a burner of the central draft blue-flame wick type comprising imperforate outer and inner wick tubes supported wholly by the burner, and a perforated basket provided with means for securing it to a lamp reservoir, the inner wick tube being adapted to telescope with the air tube of a fuel reservoir.

6. In a lamp of the central draft wick type, a center wick tube comprising a plurality of sections, one of which terminates near the top of the reservoir and is provided with a contracted upper end adapted to be telescoped by another section, and to form a drip cup at their juncture.

7. In a lamp, a wick tube of a plurality of sections, one of which is provided with a. contracted end, another section arranged to inclose a part of the contracted end, and heat insulating means to separate the tube sections.

8. In a lamp, the combination with a reservoir and a burner, of a Wick tube having a plurality of coperating sections, a section terminating substantially within the reservoir and provided with a plurality of reduced portions at the upper extremity,

and another section carried by the burner and having a variable connection with a reduced portion of the reservoir section.

9. As an article of manufacture, a blueflame burner having 4a removable wicking section and including connected imperforate inner and outer wick tubes, and a basket, the basket being applicable to a central draft` lamp reservoir, and the inner wick .tube being` adapted to coincide with the draft tube of said reservoir.

10. A burner for a lamp of the central draft Wick type comprising a frame having a spacing element, a sectional outer tube,

one section of which is mounted on the spacing element and carries a substantially horizontal fiange, the other section of the outer tube being mounted from the lower portion of the burner, and an inner Wick tube supported in predetermined relation to the frame and the outer tube flange by bridging elements extending from the lower portion of the outer wick tube.

l1. In a central draft lamp, a sectional inner wick tube having an imperforate burner section and a detachable burner supporting the burner sec'tion of said inner tube, an imperforate outer wick tube, a rack controlled Wick carrier removable with a wick and mounted for movement between said outer tube and the section of the inner tube, the wick tubes and wick carrier being mounted in the burner to be detached from a lamp as a unitary structure.

12. A burner for a central draft lamp having an outer Wick tube and an imperforate section of an inner wick tube supported by bridging elements, and a wick carrier having bifurcated portions which are adapted to straddle the bridging elements.

13. A burner for a lamp of the central draft wick type having inner and outer wick tubes, means tol space the inner wick tube from the outer wick tube, a wick carrier removably mounted within the burner between the wick tu'bes and provided with means to limit its movement in the burner in one direction, and a removable wick raising rack having means to deta-chably mount the same on the wick carrier and to engage the tube spacing mea-ns when t-he carrier is in one position to limit the movement of the carrier.

14. In a lamp of the central draft wick type, a burner removable as an entirety from the lamp, said burner having a frame, an outer wick tube of a plurality of sections, a removable sect-ion being supported from the frame, a burner cone mounted on the frame exterior of the outer wick tube, a section of an inner wick tube, a spreader carried by the inner wick tube section, and means to support the inner wick tube and its spreader from a fixed section of the outer wick tube and in fixed relation to the burner cone.

15. A burner for a lamp of the central draft wick type, comprising inner and outer wick tubes, a vane connecting the inner and outer wick tubes to maintain them in fixed relation to each other, a substantially tubular wick carrier adapted to engage. the outside of a. wick and mounted for operation between the wick tubes and provided with an elongated slot to receive the vane, and means to actuate the wick carrier.

16. In a lamp of the central draft wick type, a burner comprising inner and outer wick tubes, said outer wick tube having a plurality of sections, one of which is removably supported by a perforated supporting` ing the inner wick tube for operation between the wick tubes Iabove the vane, said wick carrier being provided with a slot to straddle the vane, and provided with means adjacent the slot to be detachably engaged by a rack, and means carried by the burner to elevate andlower the rack and the wick carrier.

18. A lamp of the central draft wick type having a sectional inner wick tube providing a section for the lamp font and a section for the lamp burner, the burnerof the lamp being provided with an outer tubeof removable and fixed sections, yand means near the base of the burner to support the inner tube section of the burner in a predetermined re'- lation to the fixed section of the outer tube to leave the remaining space between the wick tubes and the burner unobstructed for the manipulation of the tubular wick ele.-

vating mechanism.

19. In a lamp of the central draft wick type, a burnerframe -provided with imperfo# rate inner and outer wick tubes, said outer Wick tube comprising a plurality of sections, one of which is fixedly mounted, means to firmly mount the inner wick tube from the fixed section of the outer wick tube, a pant of the fixed sectionof the outertube and a part of the burner Section of the .inner tube extending below the burner frame.

20. A burner for alamp of the central draft Wick type having a removable foraminous supporting element supported from a basket part of the frame of the burner, an outer wick tube for the burner of a plurality of sections, one section being fixedly mounted to the removable foraminous supporting element, and having telescopic engagement with the fixed section of the Wick tube, said removable section carrying a llame protecting section, and means to mountan inner wick tube section within the burner in predetermined relation to the flame protecting section of the outer wick tube.

21. A burner for a 1am of the central draft wick type having a ame, the basket member of which is provided with a circumferential shoulder seat, an outer wickl tube for the burnerof a plurality of sections, one section being fixedly mounted from the burner frame, a removable section of the outer wick tube having telescopic engagement with the fixed section thereof, and a flame protecting section secured to the removable sect1on of the outer wick tube, said flame protecting section having a tube spacing element secured thereto and having its outer extremity removably seated in the circumferential shoulder, and meansv to support an inner wick tube from the fixed section of the outer wick tube.

22. A burner for 'a central draft lamp of the wick type having a frame, the perforated basket of which is provided with means to secure the same to a lamp `font and an in-` turned annular flange adjacent the securing means, an outer wick tube secured to said annular flange of the basket to extend u-pwardly into the burner, an inner wick tube section of uniform diameter having an open lower end and supported at the lower end thereof in spaced relation to said outer wick tube and to extend -to'the top of said outer wick tube, and a verticall movable wick carrier mounted in the charner between said inner and outer wick tubes, the entire structure being detachable from a. lamp as a unitary device.

23. A burner for a central draft lamp of the blue flame wick type having a basket frame, an outer wick tube mounted from the frame, an inner wick tube havingl anv open lower end and means at the lower end thereof to retain the same with the frame,

in predetermined relation to the outer wick tube, while said inner wick tube serves to mount a flame spreader in predetermined relation to the burner one, the inner wick tube of the burner extending below the base of the basket frame to guide a wick and coperate with a central draft tube of a lamp ont.

24. A lamp ofthe class described, having a reservoir and an air tube therefor, and a detachable, burner comprising aV basketshaped and erforated body portion, the wall of said ody portion being continued slightly below the perforated portion thereof and contracted to permit entrance into the collar of the reservoir, and provided with attaching means for securing the burner in position, an outer wick tube supported lby said basket at a point which is contiguous to said attaching means, and an inner wick tube supported at its lower extremity in the burner and having an open lower end for the reception of the air tube vof the reservoir, said inner wick tube having its lower end disposed below the aforesaid attaching means.

25. In a lamp, an inner Wick tube of a plurality of sections, one section of which terminates substantially Within the reservoir of the lamp and is provided with a contracted upper end, another section of said tube extends throughout the burner, and

a ring of. heat insulating material mounted around the contracted end of the reservoir section of the wick tube to have sliding engagement with the burner section of said wick tube, said reservoir section of the wick tube being further contracted above said 1nsulating ring to form a drip cup. i

26. In a lamp of the central draft w1ck type, a burner comprising a burner frame, a section of an inner wick tube open at its lower end, and a sectional outer wick tube, one section being fixedly mounted relative to the inner tube, and the other section being removable and supfported at its upper end from the burner rame by a. spacing member.

27. In a burner for a central draft lamp, an outer wick tube, a mant-le-supportmg burner cone, a non-adjustable section of an inner imperforate wick tube, havin means to mount the same in coperative re ation to v the outer wick tube, a llame spreader carried by the inner wick tube in predetermined relation to the burner cone and its mantle, and a wick movable between said wick 'tubes lto straddle the inner tube supporting means, whereby the various parts of the burner may be removed from a burner-supporting element as a unitary structure.

28. In a burner for a central draft lamp, a basket, an outer wick tube, a mantle-supporting burner cone, a section of an inner wick tube, a Wick, a wick carrier encircling said wick and a wick raiser connected to said wick carrier below the basket, and a flame spreader carried by the inner wick tube in predetermined relation to the burner cone, and its mantle, whereby the burner as a un1- tary structure may be bodily removed from the remaining portion of the lamp.

29. A burner for a central draft lamp having an outer Wick tube and a section of an inner wick tube open at bot-h ends supported at its lower end by bridging elements, a rack controlled wick carrier adapted to encircle a wick and mounted for movement between said outer wick tube and t-he section of the inner wick tube, and a wick having a bifurcated portion adapted to straddle said bridging elements.

30. A central draft blue flame device of the wick type, comprising a complete burner having fixed inner and outer wick tubes, a supporting vane attached to an imperforate portion of said inner tube, a spreader and a cone and means to detachably mount the same from the device to permit it to be removed as a unitary structure without affecting the relations of 'the parts and the character of its llame, the fixed inner wick tube being a continuation of an air tube eX- tending through the reservoir of the device.

31. A central draft lamp of the blue flame wick type, comprising a sectional inner wick tube, one section being carried by the font` of the lamp, another imperi-crate section being carried by a detachable burner to coperate with the font section, an outer wick tube mounted on the burner andin fixed relation to a cone of the burner having an inwardly directed annular flange, a flame spreader mounted on the burner section of the inner wick tube, spacing elements to mount the burner section of the inner wick tube in predetermined relation to the outer tube so that the spreader will be maintained in a predetermined position relative to the inwardly directed flange of the burner cone, and a wick and Wick carrier mounted in the burner and operating between said inner and outer wick tubes, said wick straddling the spacing elements, said complete burner being wholly detachable as a unitary structure from the font without affecting the character of the llame of the burner.

32. An incandescent mantle lamp of the Central draft type, having av removable burner and a Vsectional coperating wick tube, one section of said wick tube being supported from the lamp font and the other section being a part of the removable burner, said burner having a detachable wick tube section to permit rewicking the lamp, said detachable section being supported at its upper end in the burner.

33. A unitary burner of the blue llame type, comprising a perforated basket, an outer wick tube, a straight inner wick tube adapted to receive air vertically at its lower end and removable with the burner, a cone, a flame spreader and an incandescent mantle, the space within the basket being in communication with the cone, the passage within the inner wick tube being in communication with the llame spreader, and said space and said passage being separated by the walls of the wick tubes to prevent the ilo-w of air through the basket and into the passage within said inner wick tube.

34.v An article of manufacture consisting of a perforated annular spacing element for a wick tube having an inner tubular seat and a wick tube section forming a continuation of said tubular seat. y

35. A burner having in combination an annular spacing element provided with a top wick tube section risin above its inner margin, and a depending aring wick tube section seated within said spacing element.

36. The combination with a reservoir having an air tube extending to near the top thereof, of a burner provided with concentric wick tubes in non-adjustable relation to each other, and a screw thread for securing said burner to the reservoir, the walls of the air tube and the inner wick tube being in alinement and adjustably and telescopically engaged, the construction being such that the telescoping action will be unimpeded until the burner threads are screwed home.

37. A lamp of the blue flame type, having in combination, a font provided with an air tube associated therewith, a burner consisting of a separable unit having outer and inner wick tubes, the inner wick tube being non-adjustable imperforate and a continuation of said air tube and the outer wick tube being supported in the burner, said inner wick tube being supplied with air through its lower end only, a burner cone provided with an inturned flange, a flame spreader sustained by said inner wick tube, an incandescent mantle, and means for supporting and maintaining the outer and inner wick tubes, the burner cone, the flame spreader and the mantle in Cooperative relation.

38. A unitary detachable burner for a central draft incandescent mantle lamp, said burner having a perforated frame, an outer wick tube, an inner wick tube open at both ends, the interior of said inner wick tube being separated from and out of communication with the space within said frame, a flame spreader mounted at the upper end of the inner wick tube, a gallery having a burner cone mounted above the perforated frame and a mantle surrounding the burner cone, the perforated frame, the outer wick tube, the inner wick tube, the flame spreader, the gallery and burner cone, and mantle being so secured in position as to maintain a concentric spaced relation to each regardless of Whether the burner is attached or detached from the lamp, the air admitted to said perforated frame being supplied only to the outside of the wick.

39. An incandescent lamp having a detachable burner unit, said unit being provided with a non-adjustable central air tube, a flame spreader and a mantle mounted t0 retain a fixed relation to the flame spreader, a reservoir containing an air tube communicating with said central air tube, said tubes being flexibly related to compensate for variations in the positions of the burner relative to the reservoir occasioned either by faulty adjustment or imperfection in workmanship.

40. A detachable annular burner unit of the blue-flame type, havingr a central passage for conveying air to the inside of the wick only, an outer passage for conveying air to the outside of the Wick only, and inner and outer wick tubes between said passages, the inner wick tube being non-adjustable adapted to match the air tube of a lamp reservoir, and the entire outer wick tube and the upper portion of the inner wick tube being mounted in said burner and removable therewith.

4:1. The combination of a reservoir having an air duct, a detachable blue flame burner, provided with concentric wick tubes, a perforated basket adapted to be rigidly connected with and extending upward from the top of the reservoir to near the level of the upper ends of the wick tubes and constituting an undivided air chamber, and a spacing element disposed between and preventing relative movements of the basket and the outer wick tube whereby they are held in fixed relation to each other.

42. As an article of manufacture, a detachable burner unit for a central draft incandescent mantle lamp, said burner including outer and inner wick tubes, a wick and a wick carrier attached to said wick, said carrier and wick being removable from the burner as a unit.

In testimony whereof, I aflix my signature, in presence of two witnesses.

CORTLAND W. DAVIS.

Witnesses:

F. W. SPANGLER, W. H. F. NErLLoR. 

